Model comparison
Claude Haiku 4.5 vs Grok 4.20
Head-to-head evidence from 2 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Haiku 4.5 #82 (Estimated); Grok 4.20 #93 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Haiku 4.5 and Grok 4.20 share 2 comparable benchmark results. 1 of 8 categories are comparable. 4 results are unique to Claude Haiku 4.5; 17 to Grok 4.20.
Updated July 28, 2026- Shared results
- 2
- Claude Haiku 4.5 only
- 4
- Grok 4.20 only
- 17
- Comparable categories
- 1 / 8
Pick Claude Haiku 4.5 if you want the stronger benchmark profile. Grok 4.20 only becomes the better choice if you need the larger 2M context window or you want the stronger reasoning-first profile.
Confidence note. This is a partial-evidence comparison with 2 shared benchmark results across 2 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Haiku 4.5 has the cleaner BenchAlign overall profile here, landing at 55.77 versus 53.88. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Claude Haiku 4.5's sharpest advantage is in coding, where it averages 73.3 against 67.1. The single biggest benchmark swing on the page is SWE-bench Verified, 73.3% to 76.7%.
Grok 4.20 is also the more expensive model on tokens at $2.00 input / $6.00 output per 1M tokens, versus $1.00 input / $5.00 output per 1M tokens for Claude Haiku 4.5. Grok 4.20 is the reasoning model in the pair, while Claude Haiku 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Grok 4.20 gives you the larger context window at 2M, compared with 200K for Claude Haiku 4.5.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude Haiku 4.5 | Δ | Grok 4.20 |
|---|---|---|---|
| Coding | Claude Haiku 4.573.3 | Margin← 6.2 | Grok 4.2067.1 |
| Agentic | Claude Haiku 4.5Not measured | MarginNo overlap | Grok 4.2047.1 |
| Reasoning | Claude Haiku 4.5Not measured | MarginNo overlap | Grok 4.2053.3 |
| Math | Claude Haiku 4.54.9 | MarginNo overlap | Grok 4.20Not measured |
| Multimodal | Claude Haiku 4.5Not measured | MarginNo overlap | Grok 4.2070.1 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 73.3%B 76.7%Winner: Grok 4.20Δ 3.4SWE-bench Verified: Claude Haiku 4.5 scored 73.3%; Grok 4.20 scored 76.7%. Grok 4.20 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Haiku 4.5 | Grok 4.20 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Haiku 4.5$1 input / $5 output | Grok 4.20$2 input / $6 output | Claude Haiku 4.5 has the lower combined listed price. |
| Generation speedtokens per second | Claude Haiku 4.5Not available | Grok 4.20233 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Haiku 4.5Not available | Grok 4.2010.33 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Haiku 4.5200K | Grok 4.202M | Grok 4.20 lists the larger context window. |
Benchmark Deep Dive
Agentic4 benchmarks
CodingClaude Haiku 4.5 wins5 benchmarks
Reasoning2 benchmarks
Knowledge4 benchmarks
Math2 benchmarks
Frequently Asked Questions (2)
Which is better, Claude Haiku 4.5 or Grok 4.20?
Claude Haiku 4.5 is ahead on BenchLM's BenchAlign leaderboard, 55.77 to 53.88. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 73.3% and 76.7%.
Which is better for coding, Claude Haiku 4.5 or Grok 4.20?
Claude Haiku 4.5 has the edge for coding in this comparison, averaging 73.3 versus 67.1. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
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